Seamless reducing tube push bench cutter applicable to loess area

Abstract

The utility model discloses a seamless variable-diameter pipe jacking machine cutterhead suitable for loess areas, and particularly relates to the field of pipe jacking construction, the seamless variable-diameter pipe jacking machine cutterhead comprises a cutter bar, the cutter bar is composed of a circular truncated cone part, a conical part and a cylindrical part, the circular truncated cone part is fixed between the cylindrical part and the conical part, and one end of the cylindrical part is fixedly connected with a supporting frame; a guide disc is arranged at the position, located at the critical position of the cylindrical part and the circular truncated cone part, of the exterior of the cylindrical part, a plurality of fan-shaped cutter heads are annularly arranged at the positions, close to the conical part, of the exterior of the circular truncated cone part at equal intervals, and a compensation cutter body is arranged between any two adjacent fan-shaped cutter heads. According to the pipe jacking machine cutterhead, the advantage that loess is good in upright performance is utilized, when a pipeline and the side wall of the soil body have large friction force, separation of the pipeline and the soil body can be achieved by enlarging the excavation diameter, compared with a pipe jacking machine cutterhead capable of automatically changing the diameter in the prior art, the cutterhead is kept complete while the diameter of the cutterhead is changed, and the pipe jacking machine cutterhead is convenient to use. The deformation components of the cutter head are connected in a closed mode and cannot be filled with soil.

Description

Technical Field

[0001] The utility model relates to the field of pipe jacking construction. More specifically, the utility model relates to a cutter head of a pipe jacking machine applicable to loess areas and capable of seamless diameter variation. Background Technique

[0002] During the pipe jacking construction process, different soil layers are often encountered. Different soil layers interact with the outer wall of the pipe jacking to generate different frictional resistances. When the frictional resistance is large, the jacking speed of the concrete pipe is slow, which greatly affects the construction progress of the project. In the usual pipe jacking construction, although the thixotropic mud sleeve is used to reduce the frictional force between the pipe wall and the soil during the pipe jacking process, the construction efficiency still cannot be greatly improved.

[0003] In the prior art, three connecting rods are respectively used to support three cutter heads, and the three connecting rods are manipulated to separate a certain distance to achieve the effect of expanding the excavation diameter. The following disadvantages of this scheme cannot be applied in construction: when the three connecting rods control the diameter variation of the three cutter heads, wide gaps are generated between the cutter heads. When tunneling in loess, loess accumulates between the cutter heads and the cutter heads cannot be reduced anymore. Content of the Utility Model

[0004] In order to overcome the above defects of the prior art, the utility model provides a cutter head of a pipe jacking machine applicable to loess areas and capable of seamless diameter variation.

[0005] To achieve the above object, the utility model provides the following technical solution: A cutter head of a pipe jacking machine applicable to loess areas and capable of seamless diameter variation, including a cutter bar, the cutter bar is composed of a frustum part, a conical part and a cylindrical part. The frustum part is fixed between the cylindrical part and the conical part. One end of the cylindrical part is fixedly connected with a support frame, and a guide disk is arranged outside the cylindrical part at the critical position between the cylindrical part and the frustum part. A plurality of sector cutter heads are arranged at equal intervals in a ring shape outside the frustum part near the position where the conical part is located. A compensation cutter body is arranged between any two adjacent sector cutter heads. The bottoms of each sector cutter head and the compensation cutter body are respectively connected with a cutter head guide column and a cutter body guide column along the generatrix direction of the frustum part. The bottoms of the cutter head guide column and the cutter body guide column extend to the bottom of the guide disk and are respectively connected with a first stabilizing bracket and a second stabilizing bracket. The bottoms of the first stabilizing bracket and the second stabilizing bracket are respectively connected with a cutter head oil cylinder and a cutter body oil cylinder. The ends of the cutter head oil cylinder and the cutter body oil cylinder are respectively hinged to the top of the support frame.

[0006] As a further improvement of the technical solution of the utility model, the inner arc surface of the sector cutter head is parallel to and in sliding contact with the side surface of the frustum part, and the inner end surface of the compensation cutter body is parallel to and in sliding contact with the side surface of the frustum part.

[0007] As a further improvement of the technical solution of the present utility model, the compensating cutter body includes two V-shaped inclined surfaces, the tip of the V shape extends into the middle of two sector cutter disks, and the compensating cutter body is in sliding contact with the sector cutter disks on both sides through the two inclined surfaces. When the compensating cutter body slides along the axis of the frustum part with the sector cutter disks, the change in the distance between the sector cutter disks is in contact with the inclined surfaces of the compensating cutter body.

[0008] As a further improvement of the technical solution of the present utility model, while the diameter of the virtual circle formed by splicing the outer arcs of several said sector cutter disks changes, the outer end of the compensating cutter body moves away from or approaches the cutter bar, and the length of the compensating cutter body is always aligned with the length of the wide gap between the sector cutter disks.

[0009] As a further improvement of the technical solution of the present utility model, the surface of the sector cutter disk in contact with the compensating cutter body is an inclined surface parallel to the compensating cutter body.

[0010] As a further improvement of the technical solution of the present utility model, a spiral cutting edge is provided at the end of the conical part of the cutter bar, a guide rail parallel to the generatrix is provided on the frustum part, a clamping groove that slidably engages with the guide rail is provided on the sector cutter disk, the cross-section of the guide rail has a laterally convex structure, and the bottom of the laterally convex structure is concave.

[0011] As a further improvement of the technical solution of the present utility model, a number of hob cutters are distributed on each said sector cutter disk.

[0012] The beneficial effects of the present utility model:

[0013] The present utility model aims at the loess area and makes use of the advantage of the good verticality of loess. When there is a large frictional force between the pipeline and the side wall of the soil body, the separation of the pipeline and the soil body can be achieved by expanding the excavation diameter. Due to the good verticality of loess, the ground settlement generated by the structure designed by this solution is small, ensuring the safety of the ground. Compared with the cutter disk of the existing automatic variable-diameter pipe jacking machine, the cutter disk remains intact while changing the diameter, and the deformation components of the cutter disk are hermetically connected and will not fill with soil. Description of the drawings

[0014] Figure 1 It is the front view of the cutter disk of the pipe jacking machine with seamless variable diameter;

[0015] Figure 2 It is the rear view of the cutter disk of the pipe jacking machine with seamless variable diameter;

[0016] Figure 3 It is the side view of the cutter disk of the pipe jacking machine with seamless variable diameter;

[0017] Figure 4 It is the front view of the cutter disk of the pipe jacking machine with seamless variable diameter;

[0018] Figure 5 Schematic diagram of the cooperation between the sector cutter head and the guide rail;

[0019] Figure 6 Front and rear comparison diagram of diameter change (side view);

[0020] Figure 7 Front and rear comparison diagram of diameter change (front view).

[0021] In the figure: 1. Sector cutter head; 2. Compensation cutter body; 3. Cutter bar; 3.1. Frustum part; 3.2. Cone part; 3.3. Cylinder part; 3.4. Spiral cutting edge; 3.5. Guide rail; 4. Guide disc; 5. Support frame; 6. Cutter head guide column; 7. Cutter body guide column; 8. First stabilizing bracket; 9. Second stabilizing bracket; 10. Cutter head oil cylinder; 11. Cutter body oil cylinder; 12. Hob. Specific implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] As shown in the attached Figures 1-7 A pipe jacking machine cutter head applicable to loess areas and capable of seamless diameter change includes n sector cutter heads 1 and n compensation cutter bodies 2, where n is an integer greater than or equal to 3; the n sector cutter heads 1 and the n compensation cutter bodies 2 are arranged at intervals one by one around the cutter bar 3 for one week.

[0024] Among them, each sector cutter head 1 is distributed with hobs 12.

[0025] Among them, the cutter bar 3 includes a frustum part 3.1 and a cone part 3.2, the large ends of the frustum part 3.1 and the cone part 3.2 are seamlessly connected, the sector cutter head 1 and the compensation cutter body 2 are matched with the frustum part 3.1, the inner arc surface of the sector cutter head 1 is parallel and in sliding contact with the side surface of the frustum part 3.1, and the inner end surface of the compensation cutter body 2 is parallel and in sliding contact with the side surface of the frustum part 3.1.

[0026] When the n sector cutter heads 1 slide synchronously along the axis of the frustum part 3.1, the distance between the sector cutter heads 1 is enlarged or reduced, and the diameter of the virtual circle formed by splicing the outer arcs of the n sector cutter heads 1 is increased or reduced; thereby realizing the increase or decrease of the diameter of the pipe jacking machine cutter head.

[0027] The compensating tool body 2 is located between two adjacent sector tool disks 1 and is used to fill the wide gap between the sector tool disks 1. The compensating tool body 2 includes two V-shaped inclined surfaces, and the tip of the V shape extends into the middle of the two sector tool disks 1. The compensating tool body 2 is in sliding contact with the sector tool disks 1 on both sides through the two inclined surfaces. When the compensating tool body 2 slides along the axis of the frustum part 3.1 with the sector tool disks 1, the distance between the sector tool disks 1 changes, and it always contacts the inclined surface of the compensating tool body 2. When the diameter of the virtual circle formed by splicing the outer arcs of the n sector tool disks 1 changes, the compensating tool body 2 also always contacts the side surface of the frustum part 3.1, and the outer end of the compensating tool body 2 moves away from or approaches the tool bar 3, that is, the length of the compensating tool body 2 is always aligned with the length of the wide gap between the sector tool disks 1.

[0028] Specifically, the surface of the sector tool disk 1 in contact with the compensating tool body 2 is an inclined surface parallel to the compensating tool body 2, which increases the contact area, improves the tightness, and increases the mutual support strength at the same time.

[0029] The variable diameter range of the tool disk can be adjusted by changing the taper of the frustum part 3.2 of the tool bar 3. The larger the taper of the frustum part 3.2, the larger the variable diameter range of the tool disk.

[0030] The above is the principle of keeping the pipe jacking machine tool disk closed while changing the diameter. Next, the control mechanisms of the sector tool disk 1 and the compensating tool body 2 will be introduced.

[0031] The tool bar 3 also includes a cylindrical part 3.3. Of course, the cylindrical part 3.3 can be replaced by a column with other cross-sectional shapes. A guide disk 4 and a support frame 5 are installed on the cylindrical part 3.3. The guide disk 4 is located between the support frame 5 and the sector tool disk 1 (compensating tool body 2). A set of tool disk guide columns 6 is connected to each sector tool disk 1, and a set of tool body guide columns 7 is connected to each compensating tool body 2. The tool disk guide columns 6 pass through the corresponding first guide holes on the guide disk 4, and the tool disk guide columns 6 can slide freely in the first guide holes. The tool body guide columns 7 pass through the corresponding second guide holes on the guide disk 4, and the tool body guide columns 7 can slide freely in the second guide holes. The tool disk guide columns 6 and the tool body guide columns 7 are parallel to the generatrix of the frustum part 3.1, thereby realizing the sliding of the sector tool disk 1 and the compensating tool body 2 along the side surface of the frustum part 3.1.

[0032] Among them, the tool disk guide columns 6 of the same group are connected to the first stabilizing bracket 8 after passing through the guide disk 4, and the tool body guide columns 7 of the same group are connected to the second stabilizing bracket 9 after passing through the guide disk 4; a tool disk oil cylinder 10 is connected between the first stabilizing bracket 8 and the support frame 5, and a tool body oil cylinder 11 is connected between the second stabilizing bracket 9 and the support frame 5; both ends of the tool disk oil cylinder 10 are hinged to the first stabilizing bracket 8 and the support frame 5 respectively; both ends of the tool body oil cylinder 11 are hinged to the second stabilizing bracket 9 and the support frame 5 respectively.

[0033] Among them, the support frame 5 is used to connect with the driving mechanism of the pipe jacking machine to achieve torque transmission.

[0034] Among them, the cutter head oil cylinder 10 pushes the sector cutter head 1 to move, and the cutter head guide post 6 cooperates with the guide disk 4 to form a movement guide; the cutter body oil cylinder 11 pushes the compensation cutter body 2 to move, and the cutter body guide post 7 cooperates with the guide disk 4 to form a movement guide.

[0035] Specifically, each group of cutter head guide posts 6 includes two or more cutter head guide posts 6, which transmit the torque of the cutter bar 3 to the sector cutter head 1 while guiding; each group of cutter body guide posts 7 includes two or more cutter body guide posts, which transmit the torque of the cutter bar 3 to the compensation cutter body 2 while guiding.

[0036] In order to reduce the propulsion resistance, a spiral cutting edge 3.4 is provided on the conical part 3.2 of the cutter bar 3.

[0037] In order to increase the stability of the sector cutter head 1, a guide rail 3.5 parallel to the generatrix is provided on the frustum part 3.1 of the cutter bar 3, and a clamping groove that slidably engages with the guide rail 3.5 is provided on the sector cutter head 1. The cross section of the guide rail 3.5 has a laterally convex structure, and the bottom of the laterally convex structure is concave. After the clamping groove of the sector cutter head 1 engages with the guide rail 3.5, it can withstand radial tension and circumferential thrust.

[0038] Among them, in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the usual designs. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0039] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A seamlessly variable diameter pipe jacking machine cutterhead suitable for loess areas, characterized by: The invention comprises a knife bar (3), wherein the knife bar (3) is composed of three parts: a truncated cone part (3.1), a conical part (3.2) and a cylindrical part (3.3); the truncated cone part (3.1) is fixed between the cylindrical part (3.3) and the conical part (3.2); one end of the cylindrical part (3.3) is fixedly connected to a support frame (5); a guide plate (4) is arranged outside the cylindrical part (3.3) at a critical point between the cylindrical part (3.3) and the truncated cone part (3.1); a plurality of sector-shaped knife discs (1) are arranged in a circular shape and at equal intervals outside the truncated cone part (3.1) near the position where the conical part (3.2) is located; any two adjacent sector-shaped knife discs (1) are arranged at a fixed position; A compensating blade body (2) is arranged between the blade discs (1) and the compensating blade body (2), the bottom of each sector-shaped blade disc (1) and the compensating blade body (2) is respectively connected to a blade disc guide column (6) and a blade body guide column (7) along the generatrix direction of the truncated cone portion (3.1), the bottoms of the blade disc guide column (6) and the blade body guide column (7) are respectively extended to the bottom of the guide disc (4) and are respectively connected to a first stabilizing bracket (8) and a second stabilizing bracket (9), the bottoms of the first stabilizing bracket (8) and the second stabilizing bracket (9) are respectively connected to a blade disc oil cylinder (10) and a blade body oil cylinder (11), and the ends of the blade disc oil cylinder (10) and the blade body oil cylinder (11) are respectively hinged to the top of the support frame (5).

2. The seamlessly variable diameter pipe jacking machine cutterhead suitable for loess regions according to claim 1 is characterized by: The inner arc surface of the sector-shaped cutter disc (1) is parallel to and in sliding contact with the side surface of the truncated cone portion (3.1), and the inner end surface of the compensating cutter body (2) is parallel to and in sliding contact with the side surface of the truncated cone portion (3.1).

3. The seamlessly variable diameter pipe jacking machine cutterhead suitable for loess regions according to claim 1 is characterized by: The compensating blade body (2) comprises two V-shaped inclined surfaces, the tip of the V-shape extends into the middle of the two sector-shaped blade discs (1), and the compensating blade body (2) is in sliding contact with the sector-shaped blade discs (1) on both sides through the two inclined surfaces. When the compensating blade body (2) slides along the axis of the truncated cone portion (3.1) with the sector-shaped blade discs (1), the spacing between the sector-shaped blade discs (1) changes and contacts the inclined surfaces of the compensating blade body (2).

4. The seamlessly variable diameter pipe jacking machine cutterhead suitable for loess regions according to claim 1 is characterized by: While the diameter of a virtual circle formed by splicing the outer arcs of a plurality of the sector-shaped cutter discs (1) changes, the outer end of the compensating cutter body (2) moves away from or approaches the cutter rod (3), and the length of the compensating cutter body (2) is always aligned with the length of the wide gap between the sector-shaped cutter discs (1).

5. The seamlessly variable diameter pipe jacking machine cutterhead suitable for loess regions according to claim 1 is characterized by: The surface of the sector-shaped cutter disc (1) in contact with the compensating cutter body (2) is an inclined surface parallel to the compensating cutter body (2).

6. The seamlessly variable diameter pipe jacking machine cutterhead suitable for loess regions according to claim 1 is characterized by: A spiral blade (3.4) is arranged at the end of the conical portion (3.2) of the knife rod (3), a guide rail (3.5) parallel to the generatrix is ​​arranged on the truncated cone portion (3.1), a slot slidably engaged with the guide rail (3.5) is arranged on the fan-shaped knife disc (1), and the cross section of the guide rail (3.5) has a transversely convex structure, and the bottom of the transversely convex structure is concave.

7. The seamlessly variable diameter pipe jacking machine cutterhead suitable for loess regions according to claim 1 is characterized by: A plurality of roller cutters (12) are distributed on each of the sector-shaped cutter discs (1).

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